Pangenez (Pangenezim) veya Weismann Kuram\u0131 kal\u0131t\u0131m maddesinin kromozomlarla d\u00f6lden d\u00f6le ge\u00e7ti\u011fini kabul eden kuramd\u0131r. August Weismann taraf\u0131ndan \u00f6ne s\u00fcr\u00fclm\u00fc\u015ft\u00fcr.
\n \u00c7o\u011fu insan bulunan e\u015fey h\u00fccrelerine ra\u011fmen hala v\u00fccut par\u00e7alar\u0131n\u0131n kal\u0131t\u0131ma etki etti\u011fine inanmaktayd\u0131. Lamarck da bu g\u00f6r\u00fc\u015f\u00fc desteklemi\u015f kazan\u0131lm\u0131\u015f \u00f6zelliklerin aktar\u0131ld\u0131\u011f\u0131 y\u00f6n\u00fcnde fikirler ileri s\u00fcrm\u00fc\u015ft\u00fcr. Darwin de ilk zamanlar\u0131nda bu g\u00f6r\u00fc\u015f\u00fc desteklemi\u015f ve pangenezis denilen varsay\u0131m\u0131 ileri s\u00fcrm\u00fc\u015ft\u00fcr. Bu varsay\u0131mda her v\u00fccut h\u00fccresinin kana k\u00fc\u00e7\u00fck bir gemmula ya da pangenezis denilen yap\u0131lar verdi\u011fi ve bunlar\u0131n \u00fcreme h\u00fccrelerinde topland\u0131\u011f\u0131 g\u00f6r\u00fc\u015f\u00fc s\u00f6zkonusuydu. Baz\u0131 ilkel canl\u0131larda g\u00f6r\u00fclen kuyruk kopmas\u0131 vs. gibi olaylarda gemmulalar\u0131n buralarda toplanarak onar\u0131m yapt\u0131\u011f\u0131 baz\u0131 \u00e7ocuklar\u0131n b\u00fcy\u00fck aile bireylerine benzemelerinde ise gemmulalar\u0131n bazen -embriyo olu\u015fumunda g\u00f6rev almadan- do\u011frudan e\u015fey h\u00fccresine ge\u00e7erek bir sonraki d\u00f6lde etkisini g\u00f6sterdi\u011fi d\u00fc\u015f\u00fcn\u00fcl\u00fcyordu.
\nAugust Weismann (1834-1914) 1880 ve 1890\u2019l\u0131 y\u0131llarda cinsel \u00fcremeye kat\u0131lan h\u00fccrelerin v\u00fccudu olu\u015fturan h\u00fccrelerden ba\u011f\u0131ms\u0131z oldu\u011funu ileri s\u00fcren bir fikir geli\u015ftirdi. Buna g\u00f6re bir organizman\u0131n do\u011fu\u015ftan sonra edinmi\u015f oldu\u011fu b\u00fcnyesel modifikasyonlar sonraki ku\u015faklara ge\u00e7miyordu. Mutasyonlar teorisiyle de tamamlanm\u0131\u015f olan bu kavram modern geneti\u011fin kurulu\u015funa kat\u0131ld\u0131.
\n 19.yy’\u0131n sonlar\u0131na do\u011fru Weismann pangenez kuram\u0131 \u00fczerine baz\u0131 \u00e7al\u0131\u015fmalar yaparak birh\u00fccrelilerde protoplazman\u0131n s\u00fcrekli olmas\u0131na de\u011finmi\u015ftir. Birh\u00fccreliler b\u00f6l\u00fcnd\u00fcklerinde olu\u015fan yavrularda anadakinin ayn\u0131 protoplazma bulunur. Buna g\u00f6re \u00e7okh\u00fccrelilerde de b\u00f6yle bir s\u00fcreklili\u011fin olabilece\u011fini d\u00fc\u015f\u00fcnerek Germ-Plazma kuram\u0131n\u0131 ortaya atm\u0131\u015ft\u0131r. Buna g\u00f6re y\u00fcksek canl\u0131lar v\u00fccudu meydana getiren Somatoplazma k\u0131sm\u0131yla \u00fcreme h\u00fccrelerini olu\u015fturan Germ Plazma’dan olu\u015fmu\u015ftur. Germ plazma embriyonik evrelerde di\u011fer dokulardan olu\u015fmu\u015f fakat somatoplazma ile alakas\u0131 olmam\u0131\u015ft\u0131r g\u00f6r\u00fc\u015f\u00fcn\u00fc kabul etmi\u015ftir. Germ plazma sperm ve yumurta olarak embriyoyu yapar baz\u0131 h\u00fccreler embriyoda germ plazmay\u0131 olu\u015fturup de\u011fi\u015fmeden kal\u0131rken di\u011fer h\u00fccreler somatoplazma olarak farkl\u0131la\u015f\u0131r. Farelerin nesiller boyunca kuyruklar\u0131n\u0131 keserek 23. yavrunun da kuyruklu do\u011fmas\u0131yla kazan\u0131lm\u0131\u015f \u00f6zelliklerin kal\u0131t\u0131lmad\u0131\u011f\u0131 y\u00f6n\u00fcnde bulgular elde etmi\u015f b\u00f6ylece bu kuram ge\u00e7erlili\u011fini kaybetmi\u015ftir.<\/p>\n","protected":false},"excerpt":{"rendered":"
Pangenez (Pangenezim) veya Weismann Kuram\u0131 kal\u0131t\u0131m maddesinin kromozomlarla d\u00f6lden d\u00f6le ge\u00e7ti\u011fini kabul eden kuramd\u0131r. August Weismann taraf\u0131ndan \u00f6ne s\u00fcr\u00fclm\u00fc\u015ft\u00fcr. \u00c7o\u011fu insan bulunan e\u015fey h\u00fccrelerine ra\u011fmen hala v\u00fccut par\u00e7alar\u0131n\u0131n kal\u0131t\u0131ma etki etti\u011fine inanmaktayd\u0131. Lamarck da bu g\u00f6r\u00fc\u015f\u00fc desteklemi\u015f kazan\u0131lm\u0131\u015f \u00f6zelliklerin aktar\u0131ld\u0131\u011f\u0131 y\u00f6n\u00fcnde fikirler ileri s\u00fcrm\u00fc\u015ft\u00fcr. Darwin de ilk zamanlar\u0131nda bu g\u00f6r\u00fc\u015f\u00fc desteklemi\u015f ve pangenezis denilen varsay\u0131m\u0131 …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1407,1403],"tags":[6558,6557,2470,3451,6555,6559,6556],"class_list":["post-2661","post","type-post","status-publish","format-standard","hentry","category-fen-ve-teknoloji-odevleri","category-odevler","tag-embriyo-olusumu","tag-esey-hucreleri","tag-kromozom","tag-mutasyon","tag-pangenez","tag-somatoplazma","tag-weismann-kurami"],"_links":{"self":[{"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/posts\/2661","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/comments?post=2661"}],"version-history":[{"count":0,"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/posts\/2661\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/media?parent=2661"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/categories?post=2661"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/tags?post=2661"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}